Hi, I don't know about all the world's retreats, but I do know about a fantastic one :)

Yoga retreat at a little boutique hotel snuggled between the jungle and the beach in Tulum, Mexico.

Certified yoga instructor and director of YogaYou Teacher Training School in Arkansas, Sharla Holladay will be leading this retreat with Mar y Sol Barquero of Costa Rica.

Mar y Sol and Sharla will both be offering yoga and meditation classes. Mar y Sol will specialize in optional spa treatments and massages also.

Fully inclusive retreat; we get you from the airport, pamper you and then take you back to the airport. Saturday to Saturday April 3-10, 2010.

We include tons of activities and scrumptious and healthy meals, and there are optional activities such as diving that you can choose to make your vacation all your own.

For more information visit: https://www.yogayoucabot.com/Yoga_Retreats.html.

Allow us to pamper you while you deepen your yoga and meditation practice.

I recommend destination yoga which operates out of the UK and uses first-rate teachers. It runs retreats in India and on the coast of Morocco.

The best one is Feathered Pipe.It is one of the ancient yoga retreat centers located in the US.Feathered Pipe offers workshop experiences guided by some of the world’s finest teachers in a relaxed, leisurely, nature-drenched setting.Surrounded by millions of acres of forest and mountains, the Feathered Pipe Foundation hosts summer personal growth and yoga retreats in Montana as well as year-round yoga travel around the world.
check this link out.
http://featheredpipe.com/