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

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

At 16,627 feet above sea level, this unstaffed station is the highest in the world.