Christ's blood allegedly preserved in a Belgian town.

The Guardian of Tallinn.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Fountain where visitors can earn a license to be mad.

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

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

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

A subterranean house of worship carved right out of the bedrock.

Sofia's legislative center is continuously reinventing itself.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Lithuania's outdoor sculpture trail of wooden folk art.

Bohemian paradise covered in majestic forests.

Macabre astrological automaton clock dating to the late 1400s.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A mocking tribute to the past and modern leadership of Prague.

A marvel of Byzantine engineering under the streets of Istanbul.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

This historic black and white monastery is one of Bulgaria's architectural jewels.

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.