An unusual round church in London with a Templar past.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The first American department store, and home to the largest operating musical instrument in the world.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.