The castle at Bečov was founded in the early 14th century by the lords of Osek who possessed it then along with the surrounding demesne for almost two hundred years. The castle experienced its most significant development under the Pluhs of Rabštejn in the late 15th century and in the first half of the 16th century. The highest position on the hilltop is occupied by the Gothic castle which was improved with stone portals and mural paintings during the Renaissance remodelling. The courtyard of the castle is skirted by the quadrangular chapel tower, as well as by the Pluh's Palace and stables. Below the castle there is the 18th-century mansion whose central portion dates back to the Renaissance period. The Romantic adjustments according to the plans by the architects Zítek and Mocker were only implemented to a minimal extent.

The castle consists of the outer ward, from which merely its outlines are known, and the castle core situated on a rocky hilltop. The castle's entrance was guarded by a circular keep. The oblong tower on the opposite side was probably later enhanced with the Visitation chapel. In the second half of the 14th century a massive quadrangular tower called donjon was added to the north-western corner of the central portion and surrounded with a ward. The architectural development of the castle was concluded by erecting an early Renaissance section connecting both quadrangular towers.

The castle's main Visitation chapel, along with its family sepulchre, was built in the smaller oblong tower probably between 1352 and 1357. In the late 14th century its walls and vaults were enhanced with exceptional and impressive Gothic paintings depicting scenes from the New Testament. The paintings have preserved to date.

This four-story residential tower of the castle bears testimony to the high aesthetic requirements and comfort of the living in those days. The main features of the donjon include its demanding portals, hearths with flat brickwork chimneys, paintings in the master's chambers, the system of lavatories on corbels, unique Gothic and Renaissance furnishings of the rooms, painted timber ceiling and Baroque roof timbers.

To meet their representative and social needs, the Pluhs of Rabštejn connected both towers with a new wing consisting of a ground floor and two stories, where dining halls with large windows were situated.

The late Baroque mansion was completed in the mid-18th century by Dominik Ondřej Kounic, the successor to the Questenberk family. This unusually laid-out site is dominated by the tower erected on the ground plan of the so-called Lacron's bastion dating back to the Thirty Years' War. The Baroque bridge leads to the early Renaissance entrance portal which was provided with a drawing bridge in the past.

A relic of the European significance, the Shrine of St Maurus represents the most valuable exhibit of the site. It was made in the first quarter of the 13th century for the Benedictine abbey at Florennes (in what is now Belgium) to contain the mortal remains of St John the Baptist, St Maurus and St Timothy. The wooden case is covered with lavish goldsmith's adornments. The statuettes representing the twelve apostles, Jesus Christ and St Maurus, as well as reliefs depicting the scenes from the life of St John the Baptist, St Maurus and St Timothy on the shrine's roof were made of gilded silver plates. The adornments also include filigrees made of gilded copper and studded with jewels and gems, as well as enamel plates representing scenes from the Old Testament and various geometrical motifs. During the French Revolution the monastery was looted, with the shrine laid aside to the local church. In 1838 Alfred de Beaufort bought the relic from the ecclesiastical authorities and had it repaired. Following an exhibition in 1888 the shrine was transferred to Bečov. Since the Beauforts were members of NSDAP and SS, they had to leave the Czech Republic at the end of the Second World War. Before leaving the country they hid the shrine below the floor of the castle chapel. As a result of a yearlong investigation the badly damaged shrine was rediscovered here on 5 November 1985 by the Czech criminal policemen. Following demanding and long restoration works the shrine is now presented in an air-conditioned safe deposit room with an insurmountable security system. A unique exhibition offers information about the relic's eventful history and challenging restoration.

The central portion of the site was guarded by the circular keep, the last refuge of the castle's owners. This tower had to be lowered to a large extent in 1623 due to its poor condition. In the 19th century, its preserved 6-meter-high portion was transformed into an observation gallery.

Since the castle ceased meeting the requirements of the Renaissance period in the mid-16th century, the Pluh's Palace was erected here, consisting of three houses. The preserved sections include the vaulted ground floor and interesting archive rooms with built-in wooden cabinets on the upper floor. The representative and residential Pluh's Palace later experienced a remodelling in the Classical style. In its wall above the mansion's gardens it keeps the mass of the Gothic battlements.

The former stables were built in the 18th century opposite the Pluh's Palace. The structure contains in its north-eastern wall above the access road the original Gothic battlements.

This administrative building was erected in the 19th century atop the castle's battlements.

Originally, this Baroque structure was connected with the mansion through a covered courtyard gallery to facilitate carrying of meals. On the first floor there is a unique clockwork-driven grilling equipment.

They constitute a remnant of the brewery which was closed down in the second half of the 19th century. In the spirit of Romanticism, they were utilised as fashionable grottos, accessible from the mansion's terraces. On the large plastered terrace above the brewery cellars spacious greenhouses used to stand.

The mansion's gardens and park on the opposite side of the castle came into existence as a result of a demanding architectural development, thus bearing testimony to the standard of garden and landscape architecture in those days. In addition to containing remnants of the original Baroque gardens, the especially valuable mansion's garden also reflects the architectural trends of the 19th and 20th centuries. The largest part of the gardens is situated on the place of the former castle moat and brewery. The garden is divided into six terraces which are interconnected by balustraded staircases, thereby forming an exceptionally picturesque space. The other typical features included static and dynamic water, as well as plants shaped into regular ornaments and formations. Following the partial demolition of the outer ward, a park was laid out on the slope above the Teplá river's bend. Predominantly planted with deciduous trees, it testifies to the increased interest in the garden and landscape architecture at the turn of the 20th century.

The conflict between the social need of having here a "modern" sala terrena and space limits resulted in an entirely unusual solution. Situated in the area of the gun bastion dating back to the Thirty Years' War, the sala terrena is accessible from the garden below the bridge.

This Classical ground-floor structure served for parking the carriages. In the south section there is a stable for one horse with marble troughs.

Remodelled in the Classical style, this Burgrave's (or Steward's) residence contains remnants of the previous Gothic structure. Its portal represents a feature of the Saxonian Renaissance.

The first tour presents a unique Romanesque relic of the European significance - the Shrine of St Maurus, along with the exhibition describing in detail the importance and fate of this exceptional antiquity.

The second tour offers the mansion's rooms which are furnished to present high-quality works of art, predominantly from the collections of the site's last owners, the ducal lineage of Beaufort-Spontin.

Dating back to the mid-19th century, the library below the chapel on the ground-floor is furnished with specially designed furniture made of oak wood. This original furnishing also includes a Classical tiled stove.

The graphic collection was an integral part of the mansion's rooms. Currently, it is presented in the first room enhanced with graphics representing mythological scenes, portraits, floral still-lifes and several ancestor houses of the Beaufort family. Especially valued is the set of graphics created according to patterns by the highly respected London painter Angelica Kauffman, extolled as "the best-educated woman in Europe".

This room received its name according to the dominant 19th-century sitting suite. In the decoration of the Red Room spacious canvases prevail, with the picture representing a musical society and both floral still-lifes ranking among the most beautiful of them.

The 17th-century Brussels tapestries represent well-known scenes from the life of the Biblical King David. Along with the large sitting suite in the style of Louis XVI dating back to the second half of the 18th century, they enhance this most representative hall of the mansion.

This room is enhanced with spacious Spanish portraits dating back to the 16th and 17th centuries. These top-quality paintings belonged to the collections of the Beaufort family. The decoration of the room also include another Baroque tapestry and massive wrought decorative plates made of copper.

The chapel is considered the most valuable interior of the lower mansion. It occupies the second floor of the structure erected on the gun bastion, with its vaulting rising up to the high cupola. Styled in the spirit of historicism, its interior came into existence in the 1860s according to the design by the architects Zítek and Mocker. After 1888, the Shrine of St Maurus was being displayed here for a short time.

The Fraus Publishing House brings out a comprehensive series called "The Unique Encyclopaedia - Monuments". The brochures of that series provide interesting, pregnant and comprehensible information about various historic sites in the Czech Republic, taking advantage of the original pictorial materials. One of the first brochures was dedicated to Bečov nad Teplou. The brochures published within that series can be bought in the mansion's Ticket Office or Souvenir Shop.