The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The hallucinogenic center of the ancient world.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Over 200 people were buried here with only a small stone to mark their final resting place.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

A darkly erotic open-air statuary in Catalonia.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

In the mid-1800s, the British military used this hilltop fort to train soldiers.

This abandoned Belgian fortress is purposefully being left to nature.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Internet rumors, often involving Icelandic singer Bjork, have abounded regarding this isolated outcrop of rock.

Watch cheese-flipping robots in action at this factory and museum.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

The U.S. Air Force has an anti-satellite laser weapon.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

More than 21,000 images fill this overlooked gem of a prehistoric site.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.