Abstract dinosaur models in London.

Eighty million natural history specimens call this gargantuan museum home.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

God's Saharan sandbox of wrath.

Crumbling necropolis set high above Fez.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

A fortified city, home to a remaining population of five families

The other side is actually green.

One of the most spectacular canyons in the world.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

Vast stretch of tide-pools with a unique Moroccan charm.

Founded as a refugee camp, now a popular tourist spot.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Catacombs turned marketplace.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.