What is this?
pillar
bridge
cave
arch
What is this?
castle
house
arch
bridge
What is this?
tent
cave
pillar (column)
arch
What is this?
nest
eggshell
cave
shell
What is this?
arch
castle
stairs
pillar (column)
What is this?
tree house
tree root
tree branch
tree trunk
What is this?
basket
bag
box
book
What is this?
nest
tree trunk
beaver dam
arch
What is this?
bridge
castle
pillar (column)
arch
What is this?
skeleton
cave
nest
eggshell ( shell )
What are these?
stairs
bridge
pillar
ladder
What is this?
basket
nest
tree house
tree trunk
What is this?
stairs
castle
ladder
basket
What is this?
arch
stairs
ladder
bridge
What is this?
bridge
stairs
ladder
arch
What is this?
arch
basket
tent
nest
What is this?
tree trunk
shell
skeleton
ladder
What is this?
basket
box
bag
book
What is this?
nest
arch
beaver dam
cave
What is this?
bridge
arch
castle
ladder