The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

The oldest hydroelectric plant in Czechia is now a museum.

Dedicated to the history of mining and minting in a region rich in silver and radium.

This fortress was designed to prevent a Nazi invasion but was never used.

This almost a century old piece of architecture had been overlooked by most, except for the drunk and the homeless

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Heralded as one of the prettiest castles in all of Czechia.

This ruined castle perched atop a rocky peak is a great place for a hike.

When the river dries up, these stones start talking.

One of the oldest, well-preserved water treatment facilities in all of Europe.

This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

Every part of this unusual home is built into the sandstone rock.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

The 14th-century ruins are said to contain healing powers.

Be(w)ar(e) the moat around this historic Czech castle.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A massive, abstract lookout tower providing a panoramic view of Prague.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

A giant interactive periodic table with real samples of the elements.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

Mysterious painted skulls in Moravia.