The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

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

This small beachside park commemorates the possibilities of discovery.

The fifth-longest natural arch in the world, and the longest outside China.

This Moab institution functions as both a rock store and a small natural history museum.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

Colorful Native American paintings are hidden within this small cavern.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

Get up close to emus and ostriches, or buy their tasty meat.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

The beautiful behemoth is one of the largest trees of its kind in the United States.

This massive redwood tree has a hole in the base big enough to drive through.

An optical illusion found amid a logged redwood forest.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The fossilized remains of ancient California redwoods.

This small museum explores Mexican history and culture through clothing.

The origin of these small islands' sweet names is a local mystery.

The southernmost outpost of the Russian Empire in colonial America.

Massive prehistoric mammals used these stones as oversized scratching posts.

A gothic-styled structure that has been the location for several movies.

Features unique photographic collections by women of the American West and historical attractions such as a two-story outhouse.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

It is the only marker for one of the most famous hate crimes in American history. There are no other memorials for him in the entire state.