This now abandoned restaurant provides some of the most amazing views of Lisboa.

Archaeological site of Iberian people ruins.

Stunning Roman aqueduct used for 1900 years and still standing.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This charming candle shop has been in business since 1789.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

One man's remarkable private collection of art from around the world.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

This 47-story "M" needed 20 years to be completed

Bacteria and algae give the salty water its bubblegum hue.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

A whimsical garden of outsider art in the Spanish countryside.

An abandoned Indian-inspired mansion.

Possibly the oldest masonry dam in all of Europe.

This exhibition space designed to look like the skeleton of a whale is hidden underground.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.