One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

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

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

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

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

An Antoni Gaudí masterpiece in Astorga.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

The basement bowling alley of this St. Paul dive bar is decorated with thousands of dollar bills.

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

Vice President Humphrey's final resting place is tucked away in this cemetery along with a few other notable figures.

A unique housing complex born from the aftermath of the Greek Civil War.

The ruined doorway is a portal to the building's turbulent and torturous past.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.