Water

This volcanic crater lake is renowned for its perfectly round shape, stunning blue-green waters, and unique geological properties.

A pile of earth left over from a water supply project was converted into an anti-aircraft installation during World War II.

An incredibly salty lake inside the crater of an extinct volcano.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

The largest Spanish artifact built in the Philippines and one of the oldest underground reservoirs in the world.

A warning against "the demon drink" adorns the northwest entrance of Glasgow Green.

This whimsical statue marks the high water level from the Great Flood of 1993.

A memorial to the Indian victims of the devastating 1923 earthquake, built in glorious Mughal style.

Explore the flooded remains of a limestone mine in Kentucky.

One of the oldest and tallest lighthouses still in service on Lake Michigan.

The only remaining section of an aqueduct that used to supply water to Manila during the Spanish occupation.

This hiking trail is scattered with the remains of a failed attempt to provide water to farmers in Dry Fork Canyon.

The world’s oldest boat lift is also known in the United Kingdom as the "Cathedral of the Canals" and one of the "Seven Wonders of the Waterways."

A historic cavernous cistern lies hidden behind a wall at San Marino’s stamp and coin museum.

A multicolored mineral mound dribbles piping hot spring water right off the side of a highway.