This underground network of tunnels in southern Vietnam are a popular tourist attraction today ... visitors can explore on raised platforms. The cistern lay undiscovered until the 16th century ...

The cistern lay undiscovered until the 16th century ... take an exciting and unique quarry tour in an ex-army truck. This remarkable underground rock church is one of Helsinki's main attractions.

Constructed in 532 for Justinian I, this sprawling underground ... the Basilica Cistern is easy to miss but worth checking out, despite its lack of interior attractions. Many said the site is ...

Some had a practical reason for venturing underground—quarrying stone for building material, digging out cisterns or mining salt. Others were drawn there for spiritual purposes, building shrines ...

One of Istanbul's most intriguing attractions, the Basilica Cistern, or Yerebatan Sarnıcı ... The cool, dark underground complex is also a great way to escape the summer heat.

Straddling Europe and Asia, the country has been at the heart of numerous empires, which have left behind archaeological attractions ... underground. Some are well known. Istanbul’s Basilica ...

We've dug up the most interesting underground attractions across the globe, from wartime tunnels and salt mines to rock-hewn temples and ancient cisterns beneath modern-day cities.

After it was rediscovered in 2010 and opened to the public in 2016, the Buffalo Bayou Park Cistern has become one of Houston's most unique hidden attractions ... from the Underground," a 30 ...