When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Houses are tucked between, on, and underneath giant boulders.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Step back in time at this 19th-century kiosk.

One of few vertical lava tubes in the world accessible by foot.

The crumbling ruins of an abandoned 12th-century monastery.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

This architectural beauty is the home to a personal collection of more than 600 examples of mechanical musical instruments.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This giant sculpture made of trash is a critique of society's wastefulness.

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

One of the largest Roman settlements in Portugal.

Perhaps the most spectacular grotto along the Algarve coastline.

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

A marvel of Byzantine engineering under the streets of Istanbul.