Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.

Roman ruins, natural methane fires and a lovely beach.

Mausoleum and Holy Seat of Antiochus I of Commagene.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Site of one of World War I's most horrific scenes.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A moving memorial to the fallen and missing from WWI trenches.

Climb inside an iron crystal magnified 165 billion times its normal size.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A little sculpture with a large wardrobe.

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

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Historic medieval fortified city in southwest France.

Abandoned Nazi train station turned underground astroparticle laboratory.

Isambard Kingdom Brunel, one of the great Victorian engineers, was the driving force behind the short-lived atmospheric railway.

Giant naked man on a hillside.

The UK's oldest theme park slowly slips away.

A 200-year-old prison that now houses a peculiar crime museum.

Stroll through Welsh history in a village of reconstructed structures.

Human-made caves excavated to hide a secret society of wealthy pagans.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Home to the most complete dodo remains known - one head, and one foot.