King Ludwig I's collection of beautiful women.

An old spa town in the mountains of Romania where, according to legend, the great hero Hercules once bathed.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Rome is now home to a stunning food museum and library.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

Ancient ruins hidden underneath a modern luxury hotel.

This ancient market is often referred to as the oldest shopping mall in the world.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

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

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The Pope’s secret escape route.

A forgotten "city of water" underneath the famous Trevi district.

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

The final resting place of the poets Shelley and Keats.

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

The underground sanctuary of a mysterious ancient cult.