This awkward aquarium sculpture is one of the strangest statues in Chicago.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A mysterious "wedding cake" castle in the middle of the urban desert.

Radical Bookstore and Community Space.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

This impressive Boston holy house is the American mecca for Christian scientists.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Narrowest house in Boston.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This historic patch of real estate offers a glimpse of colonial Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Limestone caves with spectacular showcase chambers.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.