Op-art architecture designed for happiness.

Visiting this café is like visiting the Austrian grandma you wish you had.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

The Habsburgs' royal collections of art and wonders.

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

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

10,000 flowered plants bloom in the City of Roses.

Their motto is, "We've been bonkers for hats even longer than you have!"

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A 19th-century shrine covered with prosthetic body parts as votive offerings.

A little piece of Paris in the sultry south of the U.S.

If New Orleans is the birthplace of the "cocktail," why does their own museum of cocktail memorabilia beg to differ?

A snapshot of the city's fascinating voodoo culture.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.