America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Largest cave system in Africa.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

Taxidermy of the racing horse with a huge heart, who inspired hope in the Depression.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

Burial site of a Jewish prophet revered in Iran.

9th century Abbasid mosque, damaged in modern warfare.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

A perfectly running 230-year-old silver automaton and music box.

This derelict building used to house infirm Freemasons, their widows, and orphans.

A Manhattan Episcopal church with an eerie underground crypt.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

Fabrication workshop where the encasement for One World Trade Center's beacon was constructed.