The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

This 19th-century church is now a popular roller rink.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

Three columns of volcanic rock shoot out of the ocean.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

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

A Wes Anderson-esque lighthouse that boasts magnificent coastal views.

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

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

This tiny museum's sizable collection is jammed into a former underground public toilet.

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

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

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