This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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.

A terrific purveyor of natural history objects and curios.

This slender three-story building has also had several famous residents.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.