The two writers famously didn't come to blows over the Oxford comma.

This historic mini-suspension bridge was swept away once but is now here to stay.

This giant statue of a vulva became internationally famous after an American exchange student got stuck in it.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

This sandstone mansion was the home of two of Oregon's most important pioneers.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

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

This largely forgotten piece of Cold War history stands hidden in the woods just north of the Mississippi Gulf Coast.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

Sculpture garden of religious statues made it through Soviet rule.

Launch site for nuclear war against Western Europe.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

To enter the lower hall of this temple, you must first walk through a dragon.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A temple to modernity, tucked away amid Barcelona's more well known museums.

300 years of pharmaceutical history on display.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

The largest permanent Monopoly board makes one of the longest games even bigger.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.