Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

This enigmatic building features numerous architectural styles.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Colorado's only active volcano last erupted around 4,000 years ago.

The remnants of a 1970 plane crash remain high in the Rocky Mountains.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Home to items never before seen by the public.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This effigy of Peter the Great is greatly disproportionate.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.

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

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.

A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

Looming communist pillar with a Czech twist.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Macabre astrological automaton clock dating to the late 1400s.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.