The vast, legendary catacombs hold secrets much stranger than stacked bones.

Try not to get slimed in Tribeca.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Three columns of volcanic rock shoot out of the ocean.

This fairytale-like structure is the last turf church ever constructed in Iceland.

This former farm In northern Iceland is now a museum, where visitors can tour beautifully-preserved turf houses.

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

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Hans Christian Andersen for the postmodern world.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Model Trains and Much More in Hamburg.

A decomissioned facility where the German "Transrapid" maglev trains were once tested.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

World's only telecommunication tower with a wooden pinnacle.

This effigy of Peter the Great is greatly disproportionate.

Bomb tests and sheep ranchers share the world's largest military land base.

This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Curious crater remnants in the middle of the Australian outback.