Detour - Immersive audio walks, now in 17 cities
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Photo Find - Navigate to the exact spot a photo was taken
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
NoFilter - Discover great photo locations all over the world.
Goodreads - See what your friends are reading.