A prehistoric geological oddity tucked behind Stockholm's natural history museum.

Sweden's oldest street has not changed for nearly a millennium.

Legend says this fabled well held part of a mythical Norse tree.

The official meeting point for the oddly named governing assembly of ancient Sweden.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

Ancient burial grounds of the wealthy.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Canyon walls shrouded in ferns.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The wooden airship was the largest flying boat ever built.

Only known mainland rookery of the threatened Stellar sea lion.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A military museum, art park, mausoleum, and architectural oddity all on one fascist's estate.

Fountain where visitors can earn a license to be mad.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

A sulfuric hellscape in southern Italy.

Beautiful views and Roman-style statues on the Italian coast.

The Emperor Tiberius' palace of debauchery.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A 16th-century horror show built in a lovely Italian garden.