A replica of the first public theater built in California.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

The California capital city once stood 10 feet lower than it does today.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Scotland's oldest purpose-built concert hall houses an incredible collection of ornate, centuries-old keyboards.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A Wild West saloon that helped define a generation of psychedelic rock.

A former mining hospital is now a vibrant artistic hub.

Back in the day everyone who was anyone played this historic western theater.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

At high tide this strange footbridge appears to have no purpose whatsoever.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

A mysterious monument covered in a binary code marks the heart of tech.

A lonely monument to the original Silicon Valley tech campus.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

This stone was once used by druids to determine a person's innocence or guilt.

An American ghost town hides along a side street in Scotland's capital.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

An ancient stone with mysterious origins stands in a residential neighborhood.

These trenches were used to train the Scottish military for life on the frontlines of World War I.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.