Tvrz Boskovštejn, Medieval fortified house in Boskovštejn, Czech Republic.

Tvrz Boskovštejn is a rectangular building on the village green, with a lower section of stone masonry and an upper part of mixed masonry. Its round corner turrets end in polygonal caps. A Renaissance remodelling around 1600 added an upper floor and vaulted the central hall, but later rebuilding as a granary and an insensitive reconstruction erased much of its original character.

The Lords from Náchod built this structure in the 16th century as a defensive stronghold for their lands. Around 1600 it received Renaissance updates, and in later years it served as a grain storage building for the surrounding countryside.

The building now houses the Muzeum kol (Bicycle Museum), opened by its last private owner after decades of disuse. The name Boskovštejn comes from the village on whose green the fortress stands. Visitors can see the rectangular plan with round corner turrets topped by polygonal caps.

The building today functions as a museum focused on bicycles and cycling history with guided tours available. Visiting with a guide helps understand the layout and how the original rooms served different purposes over time.

The round corner turrets on the upper storey end in polygonal caps, a detail visible from the village square. The lower walls are stone, the upper parts mixed masonry. The building was converted into a granary in the early 18th century, and it still served that purpose in the early 1970s.