These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

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

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

An icon among Florida's pre-Disney tourist attractions.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

The romance of early commercial flight still fills this Art Deco destination.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Extraordinary objects lurk in this quintessential regional museum.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

A former major munitions plant that has been converted into a sprawling art space.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The rogue roots are gradually consuming some of the historic marble grave markers.