The first tunnel to be dug beneath a river, repurposed as an art and museum space.

Glasgow's memorial to the International Brigade volunteers from Great Britain who fought and died in the Spanish Civil War.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

Sniff the Titan Arum's rotting flesh.

This unassuming oasis elevated just above the busy streets of Jerusalem offers one of the best views of the Old City.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

A surreal statue honoring Prague's favorite literary son.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

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

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

The curios of pharmacist and collector Henry Wellcome.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

A measuring mishap led to these artificial stone ladies losing their stomachs.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A tongue-in-cheek arcade where the games are based on everyday life.

Come for the flowers, stay for the bats!

A whimsical menagerie of creatures carved into a 300-year-old tree trunk.

A colorful street named for the legendary Australian rock band.

These mythological giants take time out of their busy day guarding a Victorian market to let you know what time it is.

A beautiful 1920s tower filled with local hidden gems.

A Natural History and Science Emporium.