Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Oldest building in California still in use.

The headquarters of a secretive order is also a beautifully-designed park.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This blowhole is supposedly caused by a trapped monster.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A walk through the historic city center, under the streets of Seattle.

A museum dedicated to the history and exploration of both popular music and science fiction.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

The magic's in the hole!

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Hot Doug's "Hot Dog" Stand.

The palatial McDonald's that inspired Wesley Willis.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

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

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.