The huge collection of paintings of the American West is one of Denver's best-kept secrets.

A collection of over 15,000 zines works to preserve DIY publishing culture.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A painfully obvious spy house sits right across the street from the Russian Embassy.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

A historic neighborhood church is reborn as a psychedelic arts collective.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

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

A world of craftwork elegantly curated in a historic brick warehouse.

Get your cosplay on at Portland’s only Medieval fantasy-themed mead hall.

Definitely not a clown bar.

On East Burnside, a 24-hour vending machine distributes world-class pastries.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

This Portland shop is brimming with natural wonders, local art, and handmade goods fashioned from recycled materials.

Hundreds of handmade critters fill this tiny window gallery in the heart of Portland's Alberta Arts District.

The oldest tofu shop in the United States is a firm favorite with locals.