The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

The world's largest collection of intentionally useless inventions.

A history of heat is on display at this unique Austrian museum.

Baroque celebration of the end of the Great Plague of Vienna.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Electrical curiosity museum housed in an old transformer station.

Austria's very first and only nuclear power station was completed but never used.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

One of the best collections of wax anatomical models in the world.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Handsomely crafted representations of our round planet.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Largest Kauri tree in New Zealand.

One of the world's largest Tesla coils.

An archive of nearly every day of Buckminster Fuller's life.