Reservoir

A water reservoir disguised as a castle stands atop a hill in a park in Stockholm city.

This unusually-named reservoir found a second life as a nature preserve.

In 1912, a broken section of the reservoir wall released millions of gallons of water and destroyed many homes downhill.

This former water source for the City of Brooklyn is now a thriving natural wetland.

The only surviving building of historic West Boylston, which was flooded to create the Wachusett Reservoir.

This large artificial waterfall in Washington state was merely an incidental byproduct of a technological megaproject.

This poured-concrete water reservoir is a gem of modernist architecture well-hidden in a city forest.

A former reservoir that was only recently discovered after more than 60 years of disuse.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

A 2,000-year-old engineering wonder hides beneath an Italian town.

The remains of a remote village that once housed over 1,200 dam workers and their families.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

London's marvelous wildfowl reserve along the Thames.

You can row a boat through this ancient underground reservoir.