18m long sarcophagus of a constantly growing dead prophet.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

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

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A unique hotel for the artistic soul.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Former headquarters of the KGB.

Dozens of padlock-trees along the Moscow River.

Stalinist skyscraper built with help of cryotechnology.

Gargantuan home of Russian science.

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

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

A modern Nordic Pompeii on the Icelandic island of Heimaey.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Three columns of volcanic rock shoot out of the ocean.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The final resting place of soldiers' loyal canine companions.

Protecting the dead from opportunistic body snatchers.

The most loyal of little dogs, or a Victorian era publicity stunt?