This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Swedish skyscraper with a 90° twist.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The largest greenhouse in the world is home to over one million types of plants.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

Moonbows over Kentucky.

Commonly referred to as the most photographed Victorian home in the United States.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

Highly spherical boulders on the shores of New Zealand.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This elegant arc of a waterfall marks a religious turning point.

A beautifully eclectic mix of architectural styles.

Singapore's landscaping project is home to 18 incredible Supertrees.

Bridge that died in war and was resurected.

Monasteries on rock pillars, once accessible only by frayed ropes.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This one-time health resort was used by aristocrats around the world.