The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

Concrete construction materials turned into a fashionable capsule hotel in rural Mexico.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

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

Russian researchers who have been excavating ancient squirrel burrows may have brought a 32,000-year-old plant back to life.

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

A 360 degree battlefield experience.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

The tallest hotel in Europe.

Dozens of padlock-trees along the Moscow River.

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

Former headquarters of the KGB.

Museum celebrating the achievements of the Soviet space program.

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

Back in the tiny USSR.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Immortal combat in a Moscow museum.

“Invented in Key West, Perfected in Brooklyn."

Four cars from the old system were once on display, but were removed in 2014.