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

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This sprawling bookstore spans four floors and has more than a million books in stock.

South Korea's largely symbolic, barely used gateway to the North.

A fearsome dragon clings to a corner of Munich's city hall.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

For nearly a year, General Ulysses S. Grant was based here during the American Civil War.

To find the "unicorns of the deep" you've got to go downstairs.

Amsterdam's former hotspot for public executions and dissections.

A replica of the decorated wooden pillars Viking sailors threw overboard when finding new places to establish a settlement.

Iconic red and white plaques show the creative names invented to navigate the city streets.

The South's nickname was supposedly born at a former bank in New Orleans' French Quarter.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.