California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

A beautiful geyser under environmental threat.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Only hotel where you can legally launder money.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

The miraculous hydrant that saved the Mission District in 1906.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

An essential stop before plundering, BYO Cutlass.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

2300-year-old Roman road connecting the empire.

In the Middle Ages, villagers would sound this stone trumpet to boost fertility and coax fish to shore.

New York City's smallest piece of private property.

Rotting dome home spotted near Chapel Hill, North Carolina.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A tribute to Ponce de Leon's supposed quest for eternal youth.