Remnants of a cone-shaped Nazi bomb shelter.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This lurid German fountain plots the sad course of marriage from dating to death.

Striking occult iconography on a medieval German church.

Cold war icon and onetime "hole" in the iron curtain.

Massive galleon from a box-office bomb docked in Genoa.

Da Vinci's equestrian statue, 500 years in the making.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

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

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Auguste Maïcon, a pioneer in French aviation, was born in this house in 1891.

This massive blockhead sculpture hides an entire library.

The world's largest model of our planetary system.