A dramatic coastline that’s home to a rare pine tree.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

In September 1974, a small group of athletes completed the first modern triathlon event in San Diego's Mission Bay.

A blast from the past in central San Diego.

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

This historic graveyard was partially paved over to create a streetcar line.

One of the largest trees of its kind in California.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The world’s oldest active sailing ship.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

North America's largest accredited model railroad museum.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A magnificent, reportedly haunted mansion built for a composer by Spiritualists.

The oldest standing structure in downtown San Diego.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

This charming English house was once the home of England's most famous poet.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

A house carved into a rock in the 1940s.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Northern Ireland's Brobdingnagian stepping stones.

A geothermal paradise with bubbling mud pools and bright blue hot springs.