From Nunavut to Tierra del Fuego, you won't find any lighthouse higher than this one.

The king of U.S. high points towers over every other peak on the continent.

America's smallest "national forest" has only 33 trees.

Elaborate tile work in this railway station tells the story of Portugal.

A fantastic castle rumored to be the birthplace of King Arthur.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An intricately decorated tiny place of worship.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Monasteries on rock pillars, once accessible only by frayed ropes.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

An Art Nouveau building covered in animal gargoyles and grotesques.

3,000 market stands in five former Zeppelin hangars.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

The Guardian of Tallinn.

An abstract monument to a symphonic composer.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

Cavernous opening completely encased in Karst limestone.

The house that birthed The Old Man and The Sea is now a museum devoted to the old man who wrote it.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A "miracle" that seems to produce more holy fistfights than holy revelations.

Oldest Protestant church in the Middle East, designed to resemble a synagogue.