The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An ode to one of the dirtiest jobs during the construction of the Boulder Dam.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

An art deco ice cream shop covered in vintage train station tiles.

The seamy, underground secrets of Portland's criminal past.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

A puppeteer’s paradise offering shows, workshops, and an archive of over 2,000 puppets.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

Peer into this window for an interesting glimpse into the public utilities that make this city run.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

A bizarre house filled with an astounding array of collections.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A former Canadian Pacific Railway station turned liquor store, the first and only station in Canada visited by British royalty.

This modern pedestrian bridge on the Yarra River was modeled after an Aboriginal fish trap.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.