Places Calmmseas Wants to Go

Stunning Roman aqueduct used for 1900 years and still standing.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

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

Stormy conditions send jets of seawater bursting through holes in the cliffs.

A walkable map of the world, made from soil and stone by one man.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

The widest natural waterfall in Estonia is a sight to see in all seasons.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A stunning silver lining to global warming's gloomy cloud.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

The recurring nature of this geographic feature might make it unique in the world.

Believed to be the country's tallest waterfall, the Njupeskär is actually much smaller.

World's strongest whirlpool.

This stunning limestone waterfall is the highest in Estonia.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

A pristine crater lake 12,000 years in the making, with waters like cut glass.

On the outskirts of an opal-mining town, these baths fed by a massive underground aquifer are a natural spa.

Victoria's largest salt lake is a favorite haunt for photographers and stargazers.

A clear example of the process of erosion in action.

This gold mine–turned–swimming hole is the perfect summer picnic spot, immersed in nature and history.