The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

A sprawling ancient Jewish cemetery with over 30 rock-hewn burial caves.

This derelict superstructure was a very important warning system for the Soviet military.

A huge Soviet-era robotics factory in the outskirts of Prypiat, now long-abandoned.

This attraction was abandoned after the Chornobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A muddy alien landscape that is home to rare species of exotic plants.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

An open-air "garden" of mural art that changes weekly.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This sculpture honors the man who was known as the "Righteous Among the Nations."

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Three columns of volcanic rock shoot out of the ocean.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Walk in the footsteps of the gods and straddle two tectonic plates.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.