Have you ever looked at an oddly shaped building and wondered how it’s functional or even standing? These 12 properties are either amazing, mind-boggling or sometimes straight-up ugly.

Continue on to see 12 of the strangest buildings on Earth.

National Grand Theatre | Beijing, China

The ellipsoidal National Grand Theatre is colloquially known as The Giant Egg. It is surrounded by a beautiful artificial lake.

Photography: theatrebeijing.com

Casa do Penedo | Guimarães, Portugal

Casa do Penedo, Portuguese for "Stone House," was built entirely from the four surrounding boulders. Despite its lack of electricity, its unique design has made it a tourist attraction.

Photography: Pablo Garcia Chao

Kubuswoningen (The Cube Houses) | Rotterdam, Netherlands

According to architect Piet Blom, each cube house represents a tree in a forest of houses.

Photography: togetherintransit.nl

House Attack | Vienna, Austria

The rent is looking pretty high in this art installation at the Museum Moderner Kunst by Austrian artist Erwin Wurm.

Photography: Erwin Wurm

WonderWorks | Pigeon Forge, Tenn.

The architect of the WonderWorks museum kept their slogan in mind while designing it: "Let Your Imagination Run Wild!"

Photography: Ruslan Kapral

Conch Shell House | Isla Mujeres, Mexico

The Conch Shell House is a perfectly thematic island getaway. It was designed and finished in 2004 by Octavio and Eduardo Ocampo.

Photography: Airbnb

Casa da Música | Porto, Portugal

The Casa da Música concert hall was designed as a celebration of Portugal's designation as the European Capital of Culture in 2001.

Photography: Casa da Música

Nautilus House | Mexico City, Mexico

Stained glass casts colorful light inside this nautically inspired abode.

Photography: Arquitectura Orgánica

Kansas City Public Library | Kansas City, Mo.

If you thought the Harry Potter books were long, just wait until you see the towering editions of these classics at the Kansas City Public Library!

Photography: kansascity.com

Parc Olympique | Montréal, Canada

Parc Olympique was created for the 1976 Summer Olympics. Its accompanying Montreal Tower is the tallest inclined structure in the world.

Photography: Alain Carpentier

Habitat 67 | Montréal, Canada

Israeli-Canadian architect Moshe Safdie created Habitat 67 as an exhibition for the 1967 World's Fair. To this day it remains one of Canada's most recognizable buildings.

Photography: Wikimedia Commons

Krzywy Domek (The Crooked House) | Sopot, Poland

The Krzywy Domek serves as part of a shopping center. It was inspired by the designs of Polish artist Jan Marcin Szancer.

Photography: krzywydomek.info