Right angles in the forests of Panama.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

Sloth rehabilitation center in the jungle of Costa Rica.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

This wildlife refuge is home to more than 200 species of birds, as well as monkeys, lizards, and other wildlife.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.