An ancient Viking runestone hidden in plain view in Stockholm's old town.

The world's first ice hotel is still one of the most elaborate and beautiful.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

A replica of the straw hut where Vladimir Lenin lived in hiding, disguised as a hay farmer, in 1917.

A surreal pile of colorful junk fills a small yard in an otherwise gray neighborhood.

This small museum is basically a time capsule of daily life in the Soviet Union.

Stalin's secret bunker.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

One of the largest collections of socialist realist art shows the surprising depth of the official art of the Soviet Union.

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

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.

An ever-growing literary collection housed in the apartment where the Russian author penned his final novel.

A small part of Russia that does not touch any other part of Russia.

Specimens collected by the author of "Lolita" and self-taught lepidopterist are exhibited in his childhood home.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

The reason for the strange contortions in the trunks of these "drunken" pine trees in Russia is still a mystery.

Site of the largest impact event to occur over land in Earth's recorded history.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Nightmarish example of the unintended consequences of weapons testing.

The world's second-largest excavated hole.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.