This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This simple apartment may have inspired some of the most important theories in the history of science.

The world's longest and deepest train tunnel.

This "floating railway" is one of the world's oldest monorail systems.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A controversial memorial at the place where Captain Cook met his violent end.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Home to more than 13,000 pieces of war memorabilia and military equipment.

Secret North Korean passage discovered below the world's most dangerous border.

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

Derelict airplane bodies serve as both home and income for three Thai families.

A dazzling temple featuring a towering 12-meter golden Buddha.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Climb to the top of the world's largest seated bronze Buddha.

A battle between nature and architecture in the Cambodian jungle.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

On the Hudson resides one of the largest clocks in the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A bit of retro transportation flair preserved in the world's largest department store.