A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

The world's largest collection of the world's largest objects is in one small Illinois town.

An office built to look like a giant basket.

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

A miniature city built by a single hunchbacked monk.

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

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

One street divides a single town that stands in two U.S. states.

The remains of the iconic train crash from the movie 'The Fugitive' can still be found rusting along the Great Smoky Railroad.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Man-made geyser that rises to the exact height of the Gateway Arch.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

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

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

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Less a museum than a bizarre fantasy world created by artists and engineers.

If astronomy had a ghost, it would look like this observatory.

The world's largest anatomically accurate brain sculpture.

One-layer pyramid in Indiana.