This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Thousands of well-dressed mummies below a monastery.

Pompeii's less famous neighbor is still revealing her secrets.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

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

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Renaissance villa and gardens complete with a tormented colossus.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

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 underground sanctuary of a mysterious ancient cult.

A submerged archeological park still holds the wonders of a Roman Sodom.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A 16th-century horror show built in a lovely Italian garden.

One of New Jersey's oldest churches is a historical treasure trove.

Seven people are buried in the middle of what's now a movie theater parking lot.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.