This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

The world's oldest bookshop still in operation.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Building owners can take out tiles for free at this repository for historic building materials.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A trompe l'oeil mural remembers the original colonial building that once stood here.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A few steps from the site of the Tlatelolco massacre, this museum tells the story of Mexico's 1968 student protests.

This museum houses two of Mexico's most impressive Aztec monoliths.

This Aztec structure remained hidden until the demolition of a supermarket exposed the lost temple.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

Worm salt and other local ingredients are on the menu at this cult favorite ice cream shop.

A Volkswagen Beetle decorated with millions of beads connects Mexico's past and future.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Every year, the colorful murals of Montreal get a complete makeover.