The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

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

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

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

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

Giant marble phalluses on the sacred island of antiquity.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Quite simply the largest tree in the world (by volume).

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.