A monument to the defenders of the Arctic in Murmansk, Russia.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

The oldest pictographs on this decorated rock formation in California's Carrizo Plain date back as many as 4,000 years.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

One of the newest mosques in a city filled with thousands.

A monument dedicated to the civil uprisings that took place during the Pots and Pans Revolution.

A unique collection of drawings that represent Fremont Native American culture.

Once a meeting point for great thinkers, and the midpoint of the country.

A gift from Emperor Franz Joseph I to his wife.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Now nearly abandoned, Kaskaskia was once the capital of Illinois and one of the most important towns on the upper Mississippi.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

A faithful reproduction of Al-Jazari's enormous water clock.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

Nova reconstruction of the bridge that baffled engineers for years.

The famous author's birthplace is preserved in a town that he once described as narrow-minded.

The remains of the first saint from Alaska in the Russian Orthodox Church.

An ancient Viking village in North America that predates Columbus by 500 years.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.