The glowing blue Nymphaeum of Emperor Tiberius.

The most visited, and possibly most controversial, museum in Germany.

A cluttered and astounding collection of antiquities and curiosities.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

360° views of the city plus five floors of optical illusions and hands-on science.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

One part local history, 99 parts gruesome haunted house.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

San Francisco's newly reopened hands-on science museum.

An unusual round church in London with a Templar past.

The longest hedge maze in the world.

A winding path built in secret on the edge of the continent.

Hear the quietest sound from across the dome.

The hallucinogenic center of the ancient world.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

America's most famous piece of self-built architecture.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

The celebrated eyesore created by starry-eyed sweethearts.

An underground city of salt.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.