This large midwestern cavern features impressive rock formations and an underground waterfall.

An architecturally-focused antique shop.

A museum within a museum, devoted to history's most questionable medical devices.

Half of a waterfall goes into the river while the other half seems to disappear.

This lab's maddening silence is good for business but bad for sanity.

A stellar example of Art & Crafts architecture, and a movie set to boot.

Former 1954 Del Mar Train Station now serves signature cocktails and delightful culinary treats, and still operates as a Metro stop.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

This 90-year-old building is home to possibly the most New Englandy social club in existence.

Meet some of the most prominent figures in Black history through life-sized wax models.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

A collection of full-size movie monsters opened to the public.

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

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

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

A free, public museum dedicated to the fascinating science of sight.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

You can take a class, browse the library, or visit the lavish lair of an international men's humor society.

This small-town park in southern Illinois has a 1,000,000-gallon swimming pool and a 100,000-barrel oil well.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

As communication goes completely wireless, this Maine museum remembers all the wires that got us to this point.