These small, triangular, colorful houses are a staple of Madeira Island.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

The heroic tale of a remarkable pup who refused to leave her master's side, no matter what.

These crude contraptions were used to aid in the mining of lead, silver and gold.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

This modest relic, with rich history as a strategic fort through multiple eras.

The oldest working mechanical clock in the world.

Legend holds that the Ancient Greek goddess of love once bathed in the waters of this grotto.

This abandoned ship has remained in place since it ran aground in 1998.

An ancient necropolis of magnificent tombs.

Beneath an ancient wishing tree lies an underground chapel with 12th-century frescoes and catacombs dedicated to a lady saint.

Legend holds that St. Paul was flogged for preaching Christianity at this pillar.

Naturally protected city carved from a rock face.

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

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A charming beach town in Turkey captures all the colors of the rainbow.

It's possible to walk inside one of the largest Neolithic tombs in Britain.