This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

The world's oldest known salt mine.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

A mocking tribute to the past and modern leadership of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.