This freshwater spring fills with 10,000 gallons of water per minute.

Poseidon? No one seems to know.

This legendary city has been a tourist attraction for centuries.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Giant marble phalluses on the sacred island of antiquity.

The rocky remains of an ancient Greek forest.

Ancient Greek oracle of the dead.

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

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Renaissance villa and gardens complete with a tormented colossus.

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 middle finger of modernity.

An unusual house built using an iso-elastic membrane.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Geothermal waterfalls in Tuscany.

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

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Jesus' footprints and the first catacombs in the world.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The final resting place of the poets Shelley and Keats.