(CNN) — It's an unfortunate traveler that must choose a vacation destination on the quality of its toilets. At least they now have a handy guide.
Backpacker bible Lonely Planet has published a handsome new book that collects photos of some of the world's more interesting restrooms.
More than 100, ranging from pop-up pissoirs on the back streets of London to clifftop drops in Tanzania, are gathered in "Toilets: A Spotter's Guide."
Some are humble stick-made affairs, located in forsaken corners where few travelers would wish to linger.
Others are lavishly appointed "works of art" that offer incredible views alongside the most comfortable of comfort breaks.
"As any experienced traveler knows, you can tell a whole lot about a place by its bathrooms," the book's introduction says.
"Whatever you prefer to call them -- lavatory, loo, bog, khasi, thunderbox, dunny, washroom or water closet -- toilets are a (sometimes opaque, often wide open) window into the secret soul of a destination."
Click through the above the gallery to see some of the best.
Then, just to be on the safe side, wash your hands.