Historic medieval fortified city in southwest France.

The largest underground church in Europe.

In 1927, a biplane disappeared while attempting to complete the first non-stop transatlantic flight between Paris and New York City. This memorial stands at the last place it was seen.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The world's tallest boat lift stands as a massive piece of industrial tourism.

This 100-foot tall tombstone memorializes victims of 40 years of nuclear testing in Kazakhstan.

For centuries, Jeddah’s old town was a major trading port and a point of entry for Hajj pilgrims traveling by sea.

A grassy pyramid named after a French battle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

Six rock shelters covered in abstract art created by ancient Ugandan tribes.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

Crumbling necropolis set high above Fez.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A surprising number of shipwrecks visible just off the Somaliland coast.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

This giant volcanic crater holds its very own field of salt.