A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

A private collection of massive steel monsters guarding a Texas pipe works.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

A former electrical substation is now home to an eccentric junk art masterpiece.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Continuing the tradition of the dime museum in style.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A kaleidoscopic warehouse-maze of handmade neon signs.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A lush green oasis in the middle of Chicago.

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

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.