The only monument to name all of the passengers and crew who died on the RMS Titanic.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

Sweden's oldest street has not changed for nearly a millennium.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

These limestone cliffs are associated with the Greek myth of Prometheus.

Sited in an Inner Mongolian desert are the remnants of an important trade stop along the Silk Road.

A place to see how French aristocrats lived in the early 1900s.

These sculptures honor the knights who once called Carrickfergus Castle their stronghold.

Countless grotesque faces stare out from this eerie Prague art wall.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

This ruined castle perched atop a rocky peak is a great place for a hike.

Gargoyle head that brings good luck.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A musical instrument played by the sea.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

A 16th-century horror show built in a lovely Italian garden.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

This former school is now abandoned and a canvas for graffiti artists.

An unassuming Swiss institution houses Europe's largest toy museum.

One of Europe's largest groups of dolmens remains largely off the typical tourist track.

A Roman temple perched over an Italian town, forgotten several times over.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.