Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The only castle in North America to ever house European sovereigns.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Part bookstore, part café, and part forest.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

Once home to a Scottish baronet, this 18th-century historic house doubles as a legendary art space.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

A curious blend of taxidermy, antique tools, creationism, and a purported antediluvian rock.

This research center for rare prosimians is studying how they sleep to help prolong human life.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Burial site more than 300 years old.

A maritime museum holding the remains of Blackbeard's pirate ship.

This sinkhole is disguised as a pond and named after the man who stumbled upon it.

One man's extraordinary topiary garden in a small South Carolina town.

An old train trestle re-imagined as an Egyptian obelisk.

The world's largest fire hydrant is supposedly tornado-proof.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.