The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

A centuries-old forgotten underworld lies beneath Malta.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Dynastic Home of the De Piro Family.

This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

This spooky statue sits outside a famous Prague theater.

A crucified and bearded female saint.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

A saintly relic hidden in a Prague church basement.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This doorless 20th-century elevator doesn't stop or slow down.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This artificial cave looks like something out of a fairytale.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.