In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

An architectural oddity hides in plain sight on this iconic London bridge.

This London plaque marks the spot where David Bowie's famous alien made his debut.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

Read a book next to a Midtown waterfall.

Sniff the Titan Arum's rotting flesh.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

Mountain where Jesus was first tempted by the Devil.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

The statue honors a beloved bird that once roamed St. George's Market.

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

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.