This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Huge stairway leads to this massive gallery.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Step back in time at this 19th-century kiosk.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

Lady Liberty's original designer installed a little clone in this French fountain.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The world's largest reflecting pool is just two centimeters deep.

Come for the bread-themed puppet show, stay for the buffet.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This bridge was constructed from the rubble of the infamous Bastille.

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

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

This monumental work of art symbolizes the coming together of a previously divided city.