The highest point in Delaware is located under a trailer so this marker across the street will have to do.

The Decoy Capital of the World.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A failed piece of Orientalism has become the proud symbol of a community.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This jail which was in service for over a century is now open for curious visitors.

A toxic ghost town sitting atop a massive coal fire.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

A building so large that it has its own weather.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Dr Barnes' $25 billion private collection of art and arboretum.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The "lovely red Vega" of the legendary record-settling pilot.