The hallucinogenic center of the ancient world.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

One of the smallest towns in the United States.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

This erect, phallic geological spire wasn't always named so domestically.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Gargantuan home of Russian science.

Home of the future Emperors of Russia.

The tallest hotel in Europe.

Its front wall is striped with a menagerie of fantastic beasts and magnificent monsters.

Dozens of padlock-trees along the Moscow River.

Moscow's imposing monument to the Space Age.

Back in the tiny USSR.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.