A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Soaring over the Niagara Whirlpool since 1916.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This whimsical fountain pays tribute to Toronto's four-legged friends.

Willy Wonka would love this weird half-a-home.

Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

The largest mosque in Cambodia was built to unite the country's Muslim community but soon sparked division and controversy instead.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

Though it was originally dedicated to the Hindu god Shiva, Baphuon was converted to a Buddhist temple in the 15th century, complete with a massive hidden statue.

Khmer Rouge's high security prison.

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

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

One of the biggest markets in Asia, under one of the continent's largest domes.

Hoax, mistake, or evidence of dinosaurs in human times?

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.