Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The celebrated eyesore created by starry-eyed sweethearts.

This automated sculpture of two men peeing will spell out text messages with their micturition.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Commonly acknowledged as the only public monument to the Devil himself.

The earliest known map to show America, discovered by accident at a Paris bookshop.

An ancient Egyptian temple in the middle of Madrid, Spain.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

A modest museum in the final home of Italian poet and father of modern Italian, Francesco Petrarca.

The oldest botanical garden in the world that technically isn't the oldest.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.