An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

An impressive monument to Poland's independence.

Modern art commemorates one of the first military actions of World War II.

Despite its name this unique art piece was established to commemorate a tragic flood.

This spacecraft-shaped water tower is only a part of the mysterious UFO mania in this Brazilian town.

This massive blockhead sculpture hides an entire library.

An ever-growing field of footwear invites legends and more shoes.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

In memory of The Blur Building, the temporary exhibition pavilion of vaporous nothingness.

These warring psychedelic crags commemorate an unsuccessful military operation.

A forgotten monument to Yugoslavian freedom.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

This space age health spa looks like a supervillain's lair.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

A hand-built folk art installation covered with messages of God's love.

The ghostly remains of an accidental sea.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

An Australian lake whose pink hue defies scientific explanation.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A fiery crater has been burning in the Karakum Desert since 1971.