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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The last bastion of Roman presence north of the Alps looms over a German town.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Famously misunderstood wonder of the ancient world

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

These pretty kitties killed and ate as many as 135 railway workers.

This historic hotel invented the chocolate brownie.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A Museum of Holography frozen in 1974.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

One of Frank Lloyd Wright's final works was this UFO church.

This holy goods emporium is where priests go for a little retail therapy to outfit their churches.

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

The oldest farmer's market in America is so ancient it was approved by the King of England.