The beautiful baroque library of the Hapsburg empire.

Baroque celebration of the end of the Great Plague of Vienna.

The final resting place for the remains of 143 Habsburg royalty.

Handsomely crafted representations of our round planet.

The world's second-tallest flagpole stands proud despite dropping rank.

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

A town trapped in time - 1958 to be exact.

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Rusting ships sit in a desert where a sea used to be.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

The Hudson River School comes alive at this palatial estate.

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.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

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

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

Russia's own leaning tower was built on a tragic historical fable.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.