- Pomarão
- Pomarão
- Chanza Canal
- Guadiana Railway
- Guadiana Railway
- Canfranc
- Canfranc
- Canfranc
- Canfranc
- Torralba
- Bobadilla - Algeciras line
- Levkovtsi
- Levkovtsi
- Levkovtsi
- Levkovtsi
- Elbtunnel, northern building
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel, southern building
- Tiouli tunnel
- Tiouli tunnel