Copenhagen's celebrated theme park and gardens.

Once a meeting point for great thinkers, and the midpoint of the country.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

A tree that defies gravity grows in an ancient ruin.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

A sulfuric hellscape in southern Italy.

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

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

This Roman amphitheatre was also the location of the first gladiator school.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Massive galleon from a box-office bomb docked in Genoa.

Contains some of the world's more disturbing wax anatomical models.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Art and armour fill every inch of this rich kid's Italian villa.