The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

The whole of Maine's history with the salty little fish is packed into this tiny coastal museum.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

The eccentric mansion of one the most popular horror authors of modern times.

Once the most densely populated place in the world, this island is now a ghost town.

A small island with no monkeys but plenty of military ruins.

The place where the great marine explorer first learned to work underwater is not where you'd expect.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

Where beautiful signs live on forever.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Historic funicular railway, believed to be the shortest railroad in the world.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The world's oldest and largest museum of mass transit vehicles.

Toy museum in a former tavern is the expression of one man's life pursuit of the aesthetic power of cartoon imagery.

A monument marks the beginning of the longest north-south road in the United States.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.