Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Golden Gate Park's historic collection of plants.

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

This turn of the century masterpiece has a mysterious goaty interloper.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

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

Olfactory delights in San Francisco's Botanical Gardens.

A black and white mural stands out from its psychedelic surroundings.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A carousel trades in its classic horses and calliope for endangered species, native flora and fauna, and a modern soundtrack.

Most famous work of one of Frank Lloyd Wright's sons.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The most loyal of little dogs, or a Victorian era publicity stunt?

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A particularly disconcerting tribute to Irish martyrs.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The beams of the New College, Oxford dining hall come with an amazing story.