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."

San Diego's most historic and haunted home.

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

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

This stunning concert hall has become a symbol of Iceland's national recovery.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Three columns of volcanic rock shoot out of the ocean.

Along this wire fence, travelers have been leaving a particular memento since 2012.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Walk in the footsteps of the gods and straddle two tectonic plates.

This five-foot-tall bronze bird is a memorial to a species that was hunted out of existence.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

This black church sits alone among a field of lava rock.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.