The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

A centuries-old forgotten underworld lies beneath Malta.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A museum befitting the city responsible for supplying the majority of the world's LSD.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

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

The legendary building that needed ghostly approval before being built.

World's largest collection of serial killer artwork and other macabre exhibits.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A nostalgic bibliographic gem.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Villas that once served as playgrounds for the rich now fall away in decay.

In the Hugging Tree Forest, lingonberry marshmallows, hot chocolates, and the best campfire lattes north of the Arctic Circle come to you.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

This 19th-century heritage building once housed a department store that supplied British provisions in the city.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

The personal charnel house of Anton Bruckner.

American soldiers discovered Europe's best one-liner at the end of World War II.