Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Enjoy the cutest cafe experience outdoors.

A bizarre example of collective behavior resulted in thousands of shoe prints in Vegas parking lots.

A unique shopping and dining park created from old shipping containers and filled with local businesses.

The oldest standing building in Las Vegas was established by Mormon settlers.

At the base of the Spring Mountains, a unique nursery packed with desert plants.

A surreal, interdimensional shopping center and portal to another universe by Meow Wolf.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

Italian horror legend Dario Argento’s own shop hides a sinister museum-dungeon in the basement.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Go inside to really appreciate this 500-year-old technological masterpiece.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.