The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

This castle has links to Portugal’s founding and struggles for independence.

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

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

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

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

Perhaps the most spectacular grotto along the Algarve coastline.

A garden in Lisbon filled with giant porcelain creatures.

A massive underwater sinkhole made famous by Jacques Cousteau.

An important Mayan religious and trading center dating back to 200 BC.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A patch of contaminated land reclaimed as a scrappy sculptural oasis.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Golden Gate Park's historic collection of plants.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Most-visited and most-photographed slot canyon in the American Southwest.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

The fifth-longest natural arch in the world, and the longest outside China.