Church built on the site where the last tsar of Russia and his family were killed.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This effigy of Peter the Great is greatly disproportionate.

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

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

The only arched bridge made of stone on the entire Mississippi River.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

These barriers stand as stark reminders of Northern Ireland's troubled past.

These engineering masterpieces are a dominant feature of the Belfast skyline.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

Belfast's namesake river still winds below the city center, hidden from sight.

This massive monument has been telling the time for 150 years—at a slight angle.

It was once nicknamed "the most bombed hotel in Europe."

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

A popular Icelandic children's story comes to life inside this cave.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

This stunning concert hall has become a symbol of Iceland's national recovery.

Iceland's tribute to its thankless civil servants.

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