Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Invented in the mid-19th century, this machine could send copied images via telegraph lines.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

The secret medieval communication system will whisk your words above the noise of the crowd.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.

Ancient snack bar of the Roman Empire re-opened.

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

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

Gods clash with machines in a power plant regenerated as a museum.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Architectureal fantasy quarter of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A Nesting Doll of Churches.

Jesus' footprints and the first catacombs in the world.

The colonial city's social history is reflected in its fanciful door knockers.

An emporium for the weird, creepy, rare, and just plain gross.

There’s a special club house at the top for the bell ringers.