A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

An old department store turned Nazi prison turned artist commune.

Go inside to really appreciate this 500-year-old technological masterpiece.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

Medicinal spa created with the discharge from a geothermal energy plant.

Three columns of volcanic rock shoot out of the ocean.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

Model Trains and Much More in Hamburg.

The oldest landmark of Toronto is a testament to shifting sands.