A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

The land is home to swimming ponies and a legendary 18th-century treasure.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

At this former Prohibition speakeasy, electric birds signaled the arrival of hooch.

One of the world's largest Tesla coils.

A gigantic sculpture garden is packed with innovative oddities.

A unusual sanctuary for abused and exotic animals in South Jersey.

Visit the art studio of an early 20th-century painter, hidden amid the Great Smoky Mountains.

Located inside a former bread factory, this museum explores a century of transportation history through innovations that were extraordinary or failures—sometimes both.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

Dating to 1793, this is the oldest building in Poolesville.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

This historic lighthouse was well known for the large number of women who served as its keeper.

A hidden alley in urban Baltimore is a haven for graffiti artists.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

The abandoned coal loading dock is a canvas for unsanctioned art.