These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

The only castle in North America to ever house European sovereigns.

66,000 pieces of art, donated by one of the world's richest men.

A unique home built by Andrew Jackson Caldwell that also served as a military hospital.

The remains of this visionary community can still be found much as it was a century ago.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

The first modernist church in Europe.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

An exquisite Baroque church in Vienna's old town.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Legends surround an ancient tree trunk riddled with nails for good luck.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A gift from Emperor Franz Joseph I to his wife.

Elvis's own personal tropical hideaway.

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

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

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

This replica of the Greek structure is in the heart of Nashville.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."