This sprawling scenic burial ground is the final resting place of Japan's last shogun.

These precariously placed ruins harken back to a 13th-century castle.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

The commemorative stone column conceals a secret laboratory.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

This coffee shop lies hidden beneath a historic church.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Men and special assistants stand by the road to sell the day's catch in this lakeside village.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

A geological oddity topped with a 2,000-year-old pagan temple.

Apartment complexes built into huge repurposed natural gas tanks.

The world's tallest statue of an American hero.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The prototype for all Nazi concentration camps.

Dedicated to a synagogue that was destroyed after having survived World War II.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Designed as a reminder of one of the darkest moments in Austrian history.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.