Though technically an illegal structure, this eclectic DIY apartment complex is beloved by its residents.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

Nuclear waste experts study this prehistoric crater lake to envision landscapes one million years in the future.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

This tiny uninhabited islet off the coast of Norfolk Island was formed by blowing sand from nearby dunes.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

A collection of pianos and more guaranteed to delight anyone interested in music history.

The only diamond mine in the world where you can keep what you find.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

A hidden tunnel of bones in one of Malta's oldest churches.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

This hidden green space is the city's second largest conservatory.