In 1967, the lake was protected as a natural monument.

In the 21st century the site is protected under law as a scheduled monument.

The site is protected as a natural monument of the city.

In that year, it was protected as a cultural monument.

The town is protected as a cultural and historical monument.

The bridge was protected as a cultural monument in 1999.

The track work of this section is protected as a monument and remains in place.

The building has been protected as an architectural monument since 1964.

In 1994, the entire facility was protected by law as a national monument.

Since 1992, it has been protected as a cultural monument.