Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The only recreation of William Shakespeare's indoor playhouse.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

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

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

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

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

America's first federal monument.

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

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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 lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

An accidentally hidden library containing the ephemeral history of New York.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Strange red rock formations that have been attributed to a higher power for hundreds of years.