This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

This amazingly preserved Doric temple was abandoned before it was ever completed.

The ruined doorway is a portal to the building's turbulent and torturous past.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A sharp sculpture made of thousands of pieces of jagged glass.

Home to a vast and influential collection of Shakespeareana.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

This sprawling bookstore spans four floors and has more than a million books in stock.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The abandoned summer estate of the former Greek Royal Family.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

These tiny effigies are believed to represent victims of Edinburgh’s notorious Anatomy Murders.