Radioactivity still cause for concern at this urban explorer's paradise.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

A 1920s home transformed into an immersive art experience, where every room is a portal to another realm.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Visible below the waves are memorials to the city's Gold Rush dead.

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.