Two stone columns flank the grand Venice square, but there were supposed to be three.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Venice's island of the dead.

Go inside to really appreciate this 500-year-old technological masterpiece.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

There must be a pun in this haystack somewhere...

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This saucy statue once caused outrage among locals.

A memorial to honor those who were killed in a Bastille Day terror attack in Nice.

This massive blockhead sculpture hides an entire library.

This pedestrian footbridge honors Pero Jones, an enslaved African who lived in Bristol.

Cathedral-like Victorian vaults are hidden within this iconic bridge.

It houses a menagerie of wondrous taxidermy specimens from around the world, including the remains of a famous gorilla.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

The Bristol Camera Obscura housed in an ancient windmill.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

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

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.