One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The remains of this misplaced church were moved here stone by stone.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

The last street in Pittsburgh that's paved with wood.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

A controversial art piece that harkens back to local folklore.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

This sidewalk tribute honors Colorado's great culinary creation.

A beautiful combination of living flora with preserved bones covers the shelves of this shop.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

This historic hotel invented the chocolate brownie.

An overlooked memorial honoring the local Washington residents who died in World War I.

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.