These temples are among the oldest free-standing stone buildings in the world.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The Emperor Tiberius' palace of debauchery.

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

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

Iceland's tribute to its thankless civil servants.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

A two-way chairlift system between Zugliget and the highest point in the city.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

The Guardian of Tallinn.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A moving memorial to the fallen and missing from WWI trenches.