Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

An ingenious solution to a tricky engineering problem, this spiraling bridge takes drivers for a dizzying spin.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

A World War II torpedo launch station abandoned off the Polish coast.

At high tide this strange footbridge appears to have no purpose whatsoever.

Norway has built what may be the world's most beautiful public toilet.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

These warring psychedelic crags commemorate an unsuccessful military operation.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This huge metal monument is slowly being stripped to its concrete skeleton.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

This symbol of Yugoslav liberation decorated with 620 carved heads of mythical creatures is now a forlorn relic of another time.

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.