This star-shaped military outpost is now simply trying to protect itself from neglect.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Perhaps the most spectacular grotto along the Algarve coastline.

This small chapel is built of human bones and decorated with a golden skeleton.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Space-age monument to an early 20th-century uprising.

Artists made this mosque into a marvel of Ottoman baroque architecture.

Depending on the region's rainfall, this church may be partially submerged.

St. John the Baptist's forearm is housed in this remote 11th-century monastery.

A series of magical limestone formations along the coastline of the country island of Antigua.

After the nearby mercury mine shut down, this town was abandoned and declared a Superfund site.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.