A Roman-inspired temple once controlled half of San Francisco's waters.

San Francisco Bay's ghost town.

A multimedia experience that chronicles the atrocities of racism.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

This contemporary art museum is filled with other, smaller museums, which feature work from artists primarily in the Pacific Northwest.

Discover a beautiful natural paradise, minutes away from a thriving city.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Obscure and obsolete publications are given new life as works of art.

A no-frills cinephile haven known for showing offbeat, underseen films.

A living archive of urban activism and space reclaimed.

A Gothic-style abode built to accommodate the church's three resident peacocks.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

This outdoor gallery of sculptures along the East River was once a landfill.

This seaside pine grove features an exclusive watchtower that presents amazing views.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

The half-mile long structure is so impressive, it even shows up on satellite images.

London's marvelous wildfowl reserve along the Thames.

This outdoor observatory offers stellar views and a scale model of our solar system.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

This World War II airfield enjoys a second life as a public park.

This small beach park is littered with a collection of unique driftwood sculptures.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.