The secret city built by the Manhattan Project.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This historic hotel invented the chocolate brownie.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones’ locker.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Located within a historic park, the beacon is the oldest standing structure in Miami.

Electrical pylon in the shape of Disney's beloved mouse.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A small museum in the Bay of Pigs gives the Cuban perspective on the famously failed U.S. invasion.

Prehistoric history as seen through the lens of an outsider artist.

Neo-cave art on the macro scale.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

A mysterious castle built as a monument to lost love.

The sign that drew attention to a young boy's cucumber stand is now the name of his fruit superstore.

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.

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

Step back in time at this immersive historical village.