Ride a boat through this magnificent underground world, which now doubles as a theater.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A spiritual sanctuary in a natural cave.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Beautiful views and Roman-style statues on the Italian coast.

A huge enchanting public park just outside the ancient walls of Rome.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

This half-finished "city of toys" was almost Italy's own Las Vegas.

This winding road through an Italian canyon may be the most scenic drive in the world.

Romans built the world's tallest artificial waterfall in 271 BC.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Ruins of a 10th century church tucked away deep in a botanical garden.

Rare karst landscape eroded from a flat seabed.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

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.