An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

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

A submerged village appears when dam levels drop.

Perhaps the most spectacular grotto along the Algarve coastline.

The stunning interior of this Gothic church is covered in ornate gold details.

This charming candle shop has been in business since 1789.

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

A mile-long navigable cave adorned with stalactites and stalagmites reaching up to 65 feet tall.

Its tremendous toad is actually a five-story museum and viewing platform.

Surat Thani's official flower—and the world's largest—smells of rotting meat.

The cursed island of black pebbles.

During the rainy season, this temple is almost entirely submerged, accessible only by boat.

You can walk up Thailand’s naturally non-slip waterfall.

A tall karst islet popularized by 007.

Stunning wetlands ablaze with pink lotus flowers.

Eat like a bird in a bamboo nest.

A limestone wonderland of water and subterranean secrets.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.