This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

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

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

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The mark of the Devil's horns on a marble column in Milan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A fake medieval village in the middle of Turin.

A landmark in the history of technology and computing is hidden in a tiny Baroque chapel.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

This building has a giant piercing through one of its corners.

Barça football fans might see the insignia hidden in a church window as a divine sign.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

The oldest Christian monastery in Iraq until ISIS blew it up twice and then drove over it with bulldozers.

9th century Abbasid mosque, damaged in modern warfare.

The sacred shrine of the Yazidis.

Where Venice's gondolas go for a tune-up.

A marvel of Byzantine engineering under the streets of Istanbul.