Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A sculpture serving as an homage to Pope John Paul II.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Memorial built in 1922 in remembrance of WWI casualties.

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

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

Go take a picture with the inventor of the daguerreotype photographic process.

The home of the first American-born saint is one of the only curved buildings in New York.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.