The national park was once a plantation estate.

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

The highest point in Virginia can only be reached by passing through ponies and flowers.

An exotic reptile facility showcasing some of the rarest, most venomous snakes in the world.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

The remains of an early 1900s dude ranch that operated until the 1970s.

Victorian "Fancy Craft" Hair Wreaths and Relics.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

San Francisco's newly reopened hands-on science museum.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

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

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This landmark cemetery in Boston was created more than 300 years ago.

The site of Paul Revere's historic two lantern warning.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.