Moscow's imposing monument to the Space Age.

World's largest bell sits on the grounds of the Kremlin in Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

A naturally beautiful, seemingly bottomless deep blue spring.

This clifftop arch is a natural stunner.

Climb the dead electric pylons of Messina.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

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

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

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

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

Ancient snack bar of the Roman Empire re-opened.

The world's most active stratovolcano is almost always erupting.

Erotic art covers the walls of the largest ancient pleasure palace.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

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