This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A mysterious stele of unknown origin sits on the peak of this curious mountain.

Not quite the menace it once was, this monster still has some chops.

Art and a pun, all in one.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A cherry tree growing atop a mulberry tree.

Notorious artist squat renovated into legal studios.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This shop specializes in oddities and Victorian-inspired wonders.

340 bicycles, 65 feet high.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The astonishing collection of an infamous criminologist.

A striking symbol of the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The ancient latrines of the Greeks, in all their public glory.

Cozy basement bar sports an inventory of over 2,000 beers.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.