Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

One of the largest Roman settlements in Portugal.

The world's oldest bookshop still in operation.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A unique seaside cave where Aleister Crowley faked his own death.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

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