This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Museum dedicated to awful artwork.

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.