Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

A private home envelops the ruins of this 13th-century priory.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

A coastal French town said to have been visited by Jesus' disciples is a major pilgrimage center for Catholic Romanis.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A rather vulgar example of the transition from Latin to the Italian vernacular.

A Nesting Doll of Churches.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient market is often referred to as the oldest shopping mall in the world.

Breathtaking and huge 430 year old maps of Italy.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

A former French military respite turned jungle tourism hotspot.

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

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

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.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

An ancient wall in the shadows of the Amber Castle.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Sacred Indian temple that’s all monkey business.