This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

The legendary bathing site of a Moorish queen is actually part of a Roman fish farm.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The remains of the observatory of the Danish astronomer who first measured the speed of light.

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

A collection of noses tucked inside an art museum reveals how times have changed.

Gargantuan home of Russian science.

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

Back in the tiny USSR.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Museum celebrating the achievements of the Soviet space program.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

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

Bridge that died in war and was resurected.

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

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.