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

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

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

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

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

A secluded, little-known temple hidden amid the dense jungle.

A quick and simple solution to Cambodia's train woes.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

The world's largest reclining Buddha, the Giant Buddha of Mudon.

Thousands of effigies of Buddha watch from caves set high above a legendary river, plus whiskey.

Buddha shrines hide within dark tunnels at this unique forest temple.

Where an entire elephant skeleton, a snakeskin table runner, and thousands of animal remains become art.

A white Buddhist temple with a golden restroom.

In the world's most bombed country relative to its size, this incredible organization helps pick up the pieces.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

Skyscraper powered by wind turbines attached between its towers.

The world’s largest LED display, built over an F1 race circuit.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.