Sacred Indian temple that’s all monkey business.

The world's second-largest sundial, made entirely out of stone.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Rock-cut cave complex filled with ancient Buddhist artwork.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

An eccentric inventor's castle home with its own indoor weather system.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

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

A mysterious castle built as a monument to lost love.

Its buzzing collection honors vibrator history.

Golden Gate Park's historic collection of plants.

This historic Victorian hotel has a scandalous history of affairs and murder.

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

Erotic art covers the walls of the largest ancient pleasure palace.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Ozymandias’ time-keeping temple.

The largest known Ancient Egyptian obelisk.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Only hotel where you can legally launder money.

A man-made island in scenic San Francisco Bay.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

Site of a classic 19th-century physics experiment to prove the earth is rotating.