Discerning travelers can now judge vacation destinations by their toilets.

On Tuesday, travel publisher Lonely Planet released a new book, “Toilets: A Spotter’s Guide,” which features more than 100 restrooms from around the world.

“As any experienced traveler knows, you can tell a whole lot about a place by its bathrooms,” the book’s introduction says.

The 128-page tome includes a lavish London loo, a sleek bucket urinal in Slovakia and a high-tech “toylet” in Tokyo — just to name a few.