Giant wind turbine with observation deck at the very top.

Model Trains and Much More in Hamburg.

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.

Hiding the longest subterranean river known in the world.

An industrial relic is now one of Europe's most staggering art spaces.

Twisted buildings adorn the banks of the Rhine river.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The amazing wonder cabinets of a very rich Austrian archbishop.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

The footprint of a frustrated devil in Munich's Cathedral.

The ancient tomb acts as a calendar that keeps perfect time.

An ancient neolithic tomb that only sees the sun twice a year.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A graffiti Mecca welcoming artists from around the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Beautiful hillside Vermont cemetery with amazing funerary art.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.