In this German city center, the streets have no names.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

This statue of the "father of television" stands prominently in the United States Capitol.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

An original apothecary from 1792.

The narrowest house in America is seven feet of pure spite.

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

America's first federal monument.

Enthusiasts of the mid-20th century magician and comedian erected this statue in the small Welsh town in which he was born, even though the comedian only lived there for three years.

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

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

An overlooked tribute to one of the most important peace deals in American history.

A historic ruin just 20 feet away from a busy highway onramp.

Before Nixon, "watergate" meant canals.

A portal into the bricked up canal that runs through the heart of Washington D.C.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.