What appears to be an ancient Roman temple is actually a Catholic church.

The only museum with its curator—and her pets—buried inside.

These delicate sand pyramids look like naturally occurring gothic spires.

The medieval network of canals hidden underneath the city is opened to explorers each year.

This strange statue features a bust of the famous composer plopped atop a woman's body.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

Where the lovelorn find a home for their sentimental keepsakes.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This quirky collection of furniture also happens to be a public art installation.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

Once a black market electronics marketplace, now an otaku shopper's paradise.

A 20-meter (65-foot) robot towers over Tokyo Bay.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The second-highest train station in Europe.

This artistic fountain display pays homage to this area's theatrical history.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.