Ancient paintings known as the "Sistine Chapel of Cave Art."

The Hudson River School comes alive at this palatial estate.

An astounding collection of medical specimens, including bits of President Lincoln.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Ozymandias’ time-keeping temple.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Hundreds of Buddhas in a re-discovered Indonesian temple.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Seat of the Duke and Duchess of Devonshire for centuries.

This legendary city has been a tourist attraction for centuries.

A fantastic castle rumored to be the birthplace of King Arthur.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Frida Kahlo's childhood home, now a museum of her life and works.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The final resting place for the remains of 143 Habsburg royalty.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Fascinating town where normal life interfaces with the occult.

Used as an example in one of the first dictionary entries for "museum" in 1706.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

An ancient capital city that dates back 3,000 years old and harbors many surprises.