'The 440-million-pound Sears Tower is supported by 114 of these driven down to the bedrock'
pilings
A TIME TO BUILD UP: The 440-million-pound Sears Tower is supported by 114 of these driven down to the bedrock
The 440-million-pound Sears Tower is supported by 114 of these driven down to the bedrock
The 440-million-pound Sears Tower is supported by 114 of these driven down to the bedrock
A TIME TO BUILD UP
pilings
A TIME TO BUILD UP