This colorful gate stands as an entrance to the walled city of Old San Juan.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

Siberian husky that delivered a life-saving antitoxin.

Considered by many to be one of the most dangerous highways in Alaska.

The now-serene site of the largest earthquake ever recorded in North America.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

Romance fans worldwide make the pilgrimage to this group of historic covered bridges in rural Iowa.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A museum in Mississippi celebrates the history of Coca-Cola and the man who brought it to the masses.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

When flour explodes, it's not a pretty sight.

The palatial McDonald's that inspired Wesley Willis.

More than 5,000 contemporary and "historic" mustards from around the world.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

Wisconsin's most celebrated export gets the royal treatment on I-94.