High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

There’s a special club house at the top for the bell ringers.

Washington's iconic carousel has a nice piece of Civil Rights history.

The maritime museum that boasts the largest nautical library in the western hemisphere.

Headquarters of the legendary clairvoyant's readings, spiritual hospital, and massage school.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

This old-fashioned carhop restaurant gave the world the waffle cone.

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

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

A derelict bit of transportation infrastructure hidden in the woods.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

One of the only memorials dedicated to journalists who died in combat.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

Art deco landmark on the outskirts of Washington, D.C.

The world's oldest continuously operating airport was founded by the Wright Brothers.

Decades before the scandal, this staircase on the river was a literal "water gate."

Before Nixon, "watergate" meant canals.