Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

An encyclopedic collection of mammal penises.

It houses the remains of a 17th-century version of the Titanic.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

A popular Icelandic children's story comes to life inside this cave.

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

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

The most powerful waterfall in all of Europe.

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

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

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

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.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

The remains of this misplaced church were moved here stone by stone.

A pair of gigantic baby heads greet passengers at Atocha Station.

This small museum tucked within a subway station holds pieces from Madrid's past.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

This lucky bronze frog was gifted to Madrid by a casino.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.