This former coal gasification plant found a curious second life as a popular public park.

Anyone wanting to know what a dwarven mine sounds like need only visit the tunnels of this New Zealand artillery compound.

Handcrafted thermal spa washes away each night with the tide.

Tubing through a cave lit with glowworms is a magical underground experience.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

A Buddhist temple to honor insects that died for science.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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

Pilgrimage site for star-crossed lovers.

Invented in the mid-19th century, this machine could send copied images via telegraph lines.

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

An innovative local park built from an abandoned sewage treatment plant.

This sidewalk tribute honors Colorado's great culinary creation.

The oldest continuously operating fish market in the United States.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The prototype for all Nazi concentration camps.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.