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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

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

The only Bahá'í house of worship in North America and one of only a handful worldwide.

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

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Former meatpacking facility turned vertical farm and sustainable business complex.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A hot dog stand where the heads are just as hot as the dogs.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

A monument to the art of slicing people open.

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

The palatial McDonald's that inspired Wesley Willis.

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

This historic hotel invented the chocolate brownie.