Horse Arena and Barn Combos Stalls. I'd also make run out pens for the horses that are connected to their stalls.
Building An Arena at Home~Create the perfect space to ride your horse on your own property.
Riding and training
Horse Riding & Equestrian Arena Maintenance- great info, and I L-O-V-E this arena! sopretty
Dream Horse Barn
covered with lighting - could easily be made into an indoor arena later or at least somewhat more sheltered
HORSES/ Photos & Misc. Information
The classic cavaletti. A very useful tool in any arena or on a trail course.
DiY Training Obstacles
Most Common Mistakes When Building An Outdoor Equestrian Arena
We are all envious of this rider riding in the indoor arena at the Riverlands Equestrian Facility designed by GH2 Gralla Equine Architects in British Columbia. Photo credit to: Ivan Hunter Photography
GH2 Gralla Equine Architecture
Round pen connected to arena. Great idea plus it looks really nice. The only think I'd change would be that I'd add another gate on the outside of the round pen.
Building a horse-riding arena: Thinking outside the rectangle - Features - Horsetalk.co.nz
Most common mistakes when building an outdoor equestrian arena - great instructional.
Horse Barns & More