Sloth rehabilitation center in the jungle of Costa Rica.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.