Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A painfully obvious spy house sits right across the street from the Russian Embassy.

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

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

This modest marker near Notre Dame identifies the very center of Paris.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

The last four extravagant street signs of London's historic banking street.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Famously misunderstood wonder of the ancient world

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

This quiet island in the middle of a bustling city is actually a volcano dotted with Māori ruins.

This futuristic German television spire is actually the world's largest digital clock.

It's good luck to be mocked by this monkey.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

There are eight natural springs around town, each with a slightly different taste.

The prototype for all Nazi concentration camps.