The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

The other side is actually green.

One of the most spectacular canyons in the world.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

2300-year-old Roman road connecting the empire.

This amazingly preserved Doric temple was abandoned before it was ever completed.

The world's most active stratovolcano is almost always erupting.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

Italian cave with exceptional acoustics and an unsavory history.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Olfactory delights in San Francisco's Botanical Gardens.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

This modest marker near Notre Dame identifies the very center of Paris.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A beautiful Victorian-era cemetery, complete with a miniature village.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world

The only structure left with direct ties to the Salem witchcraft trials of 1692.